CreateQuery user (children 3)
 Identifier user
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration user_id (children 1)
    DataType String
   ColumnDeclaration user_type (children 1)
    DataType String
 Storage definition (children 2)
  Function MergeTree (children 1)
   ExpressionList
  Identifier user_id
